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Two-photon fluorescence excitation based on metal NPs. (a) High-depth fluorescence imaging using a two-photon FRET system for mitochondrial pH. Reproduced with permission from [139]. Copyright Chemical communications, 2018. (b) Nanosensor based on peptide-mediated graphene quantum dots/AuNPs hybrid for two-photon CN− sensing and imaging in plant tissues. Reproduced with permission from [140]. Copyright ACS applied materials & interfaces, 2015.
